.app {
  margin-left: 20vw;
}
.app .main {
  display: flex;
  column-gap: 30px;
}

.app .leftToolBar {
  display: flex;
  flex-direction: column;
}

.app .leftToolBar .link {
  padding: 6px 20px;
  border: 1px solid #000;
  border-radius: 4px;
}

.app .leftToolBar .link:focus {
  background-color: gray;
  color: #fff;
}
